It is and yet it's not. If you think about it, most of the code we benefit from each day was written by someone else from the operating system, to the language

It is and yet it's not. If you think about it, most of the code we benefit from each day was written by someone else from the operating system, to the language compiler/interpreter, to the frameworks, libraries, etc. Many developers get their queues about how to use a language, framework, library, or application because they learned how to use it on StackOverflow. Do you really know how much code was written to get to the point where you are sitting there, using all of the benefits of past coding, much of it thrown away to make way for other code for better or worse? All of that code is likely far beyond 50% of what your company has written.